Not plugged to mac, but persistent green led light

hi,

a friend of mine brought me his old macbook charger ( the one with the T type connector), and it has a strange problem: it keep having the green led on even if it's not connected to the macbook. Plus i've checked the Volts and it gives 16,88v instead of 6.5 (or whatever). What could be the cause? thanks in advance

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